The rain tax thing makes sense to me. Storm water has to go somewhere. If it hits the ground then some of the water will soak into it. Covering the ground wit

The rain tax thing makes sense to me. Storm water has to go somewhere. If it hits the ground then some of the water will soak into it. Covering the ground with a solid surface increases runoff. Which in turn increases the amount of infer structure needed needed to deal with the water and prevent flooding. Covering the ground creates an externalised cost, basically someone else is being made to pay for the economic cost of that persons decision. Without a proper price signal externalised costs result in a net loss of wealth. This is not a new thing. Laws dealing with the fact that rain water flows from property to property are in some of the oldest recorded regulations.